**Question:** The specific antagonist for benzodiazepine is:(1990)

A. Flumazenil
B. Midazolam
C. Alprazolam
D. Lorazepam

**Core Concept:** Benzodiazepines are a class of central nervous system (CNS) depressants that exert their pharmacological effects through the modulation of gamma-aminobutyric acid (GABA) receptors. GABA is an inhibitory neurotransmitter in the brain, and benzodiazepines enhance its action by binding to specific receptors (GABAA receptors) and increasing chloride ion influx, leading to increased neuronal inhibition.

Flumazenil, on the other hand, is a specific antagonist for benzodiazepine receptors. It competitively inhibits the binding of benzodiazepines to their receptors, effectively counteracting their effects.

**Why the Correct Answer is Right:** Flumazenil is a specific antagonist for benzodiazepine receptors. It works by competing with benzodiazepines for binding to their receptors, thereby blocking the action of benzodiazepines and reversing their effects on the CNS.

**Why Each Wrong Option is Incorrect:**

B. Midazolam is a benzodiazepine itself, acting at the same GABAA receptor subtype as other benzodiazepines. It would not be an appropriate antagonist for benzodiazepines.

C. Alprazolam is also a benzodiazepine, and like Midazolam, it acts at the same GABAA receptor subtype as other benzodiazepines. It would not be a suitable antagonist for benzodiazepines.

D. Lorazepam is another benzodiazepine, acting at the same GABAA receptor subtype as other benzodiazepines. It would not be an appropriate antagonist for benzodiazepines.

**Clinical Pearl:** Flumazenil is used in clinical practice to reverse the sedative, amnestic, and anticonvulsant effects of benzodiazepine overdose. In situations where benzodiazepine overdose occurs, administering flumazenil can be life-saving, as it counteracts the CNS depression and respiratory depression caused by benzodiazepines.